WHO KILLED LAURA PALMER? WELL... WE KNOW
Twin Peaks could be summarized easily. Who killed Laura Palmer?
As soon as this question was answered, the show became from outstanding to terribly bad. And it wasn't a progressive change. The change happened in just one second.
And this episode is the one. This is the episode where Twin Peaks jumps the shark and becomes so bad, that you wish that the series would have ended with the previous episode.

AUDREY
The relationship between Audrey and Agent Cooper, which was so interesting in the series, is totally destroyed in this episode.
Agent Cooper: "Audrey, I like you and I care about you. I'll always consider you my friend. "
Audrey: "Friendship is the foundation of any lasting relationship."
From that moment, it is finished. That's it. Agent Cooper is such a saint, that he becomes boring. Meanwhile, Audrey will never be interesting anymore.